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GCN Circular 33685

Subject
Fermi trigger No 704233744: Global MASTER-Net observations report
Date
2023-04-26T23:00:45Z (5 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez 
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230426.85 (trigger No 704233744,02h 34m 07.20s , -82d 24m 00.0s, R=1) errorbox  4359 sec after notice time and 4391 sec after trigger time at 2023-04-26 21:42:11 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -67.8 deg. 

The galactic latitude b = -34 deg., longitude l = 299 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2212931

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    4421 | 2023-04-26 21:42:11 |         MASTER-SAAO | (01h 27m 03.92s , -82d 29m 00.9s) |   C |    60 | 19.0 |        
    4421 | 2023-04-26 21:42:11 |         MASTER-SAAO | (01h 20m 35.65s , -82d 28m 22.5s) |   C |    60 | 19.0 |        
    4512 | 2023-04-26 21:43:41 |         MASTER-SAAO | (02h 19m 39.15s , -82d 28m 10.5s) |   C |    60 | 19.3 |        
    4512 | 2023-04-26 21:43:41 |         MASTER-SAAO | (02h 13m 08.85s , -82d 27m 02.5s) |   C |    60 | 19.1 |        
    4592 | 2023-04-26 21:45:01 |         MASTER-SAAO | (01h 45m 43.90s , -84d 21m 20.8s) |   C |    60 | 19.2 |        
    4592 | 2023-04-26 21:45:01 |         MASTER-SAAO | (01h 37m 02.99s , -84d 20m 07.1s) |   C |    60 | 19.2 |        
    4683 | 2023-04-26 21:46:33 |         MASTER-SAAO | (03h 06m 32.18s , -84d 20m 04.6s) |   C |    60 | 19.0 |        
    4683 | 2023-04-26 21:46:33 |         MASTER-SAAO | (02h 57m 48.94s , -84d 18m 59.7s) |   C |    60 | 19.0 |        
    4774 | 2023-04-26 21:48:04 |         MASTER-SAAO | (02h 35m 16.16s , -80d 32m 36.3s) |   C |    60 | 19.5 |        
    4774 | 2023-04-26 21:48:04 |         MASTER-SAAO | (02h 30m 03.26s , -80d 31m 28.9s) |   C |    60 | 19.3 |        
    4854 | 2023-04-26 21:49:23 |         MASTER-SAAO | (03h 23m 46.51s , -80d 29m 48.1s) |   C |    60 | 19.2 |        
    4854 | 2023-04-26 21:49:24 |         MASTER-SAAO | (03h 18m 34.24s , -80d 28m 43.7s) |   C |    60 | 19.2 |        
    4945 | 2023-04-26 21:50:54 |         MASTER-SAAO | (03h 14m 10.20s , -82d 26m 11.4s) |   C |    60 | 19.3 |        
    4945 | 2023-04-26 21:50:54 |         MASTER-SAAO | (03h 07m 37.28s , -82d 25m 05.7s) |   C |    60 | 19.3 |        
    5209 | 2023-04-26 21:55:18 |         MASTER-SAAO | (01h 57m 53.08s , -80d 33m 06.9s) |   C |    60 | 19.1 |        
    5209 | 2023-04-26 21:55:18 |         MASTER-SAAO | (01h 52m 46.96s , -80d 32m 26.5s) |   C |    60 | 19.0 |        
    5472 | 2023-04-26 21:59:41 |         MASTER-SAAO | (01h 19m 39.35s , -82d 30m 28.6s) |   C |    60 | 19.0 |        
    5472 | 2023-04-26 21:59:41 |         MASTER-SAAO | (01h 13m 11.66s , -82d 29m 20.8s) |   C |    60 | 18.8 |        
    5563 | 2023-04-26 22:01:12 |         MASTER-SAAO | (02h 19m 52.79s , -82d 27m 54.3s) |   C |    60 | 19.3 |        
    5563 | 2023-04-26 22:01:12 |         MASTER-SAAO | (02h 13m 25.70s , -82d 26m 48.9s) |   C |    60 | 19.1 |        
    5642 | 2023-04-26 22:02:32 |         MASTER-SAAO | (01h 45m 52.19s , -84d 22m 02.2s) |   C |    60 | 19.2 |        
    5642 | 2023-04-26 22:02:32 |         MASTER-SAAO | (01h 37m 13.88s , -84d 20m 51.2s) |   C |    60 | 19.2 |        
    5733 | 2023-04-26 22:04:02 |         MASTER-SAAO | (03h 06m 44.10s , -84d 20m 25.1s) |   C |    60 | 19.1 |        
    5733 | 2023-04-26 22:04:02 |         MASTER-SAAO | (02h 58m 02.86s , -84d 19m 22.6s) |   C |    60 | 19.0 |        
    5813 | 2023-04-26 22:05:22 |         MASTER-SAAO | (02h 35m 29.11s , -80d 32m 07.0s) |   C |    60 | 19.1 |        
    5813 | 2023-04-26 22:05:22 |         MASTER-SAAO | (02h 30m 18.29s , -80d 31m 02.6s) |   C |    60 | 19.0 |        
    5904 | 2023-04-26 22:06:53 |         MASTER-SAAO | (03h 23m 53.12s , -80d 30m 55.7s) |   C |    60 | 19.0 |        
    5904 | 2023-04-26 22:06:53 |         MASTER-SAAO | (03h 18m 41.90s , -80d 29m 54.4s) |   C |    60 | 18.9 |        
    5996 | 2023-04-26 22:08:25 |         MASTER-SAAO | (03h 14m 21.28s , -82d 24m 20.7s) |   C |    60 | 18.9 |        
    5996 | 2023-04-26 22:08:25 |         MASTER-SAAO | (03h 07m 51.99s , -82d 23m 17.7s) |   C |    60 | 18.9 |        
    6246 | 2023-04-26 22:12:35 |         MASTER-SAAO | (01h 58m 01.95s , -80d 34m 58.9s) |   C |    60 | 18.5 |        
    6246 | 2023-04-26 22:12:35 |         MASTER-SAAO | (01h 52m 52.69s , -80d 34m 18.7s) |   C |    60 | 18.3 |        
    6506 | 2023-04-26 22:16:56 |         MASTER-SAAO | (01h 26m 54.32s , -82d 29m 01.1s) |   C |    60 | 19.1 |        
    6506 | 2023-04-26 22:16:56 |         MASTER-SAAO | (01h 20m 24.61s , -82d 28m 22.4s) |   C |    60 | 19.0 |        
    6597 | 2023-04-26 22:18:26 |         MASTER-SAAO | (02h 26m 12.15s , -82d 27m 25.5s) |   C |    60 | 19.1 |        
    6597 | 2023-04-26 22:18:26 |         MASTER-SAAO | (02h 19m 43.42s , -82d 26m 45.1s) |   C |    60 | 19.1 |        
    6676 | 2023-04-26 22:19:46 |         MASTER-SAAO | (01h 54m 21.50s , -84d 21m 39.4s) |   C |    60 | 19.3 |        
    6676 | 2023-04-26 22:19:46 |         MASTER-SAAO | (01h 45m 40.29s , -84d 21m 00.5s) |   C |    60 | 19.1 |        
    6768 | 2023-04-26 22:21:17 |         MASTER-SAAO | (03h 07m 05.14s , -84d 19m 47.9s) |   C |    60 | 19.1 |        
    6768 | 2023-04-26 22:21:17 |         MASTER-SAAO | (02h 58m 21.16s , -84d 18m 44.5s) |   C |    60 | 19.1 |        
    6847 | 2023-04-26 22:22:37 |         MASTER-SAAO | (02h 35m 33.06s , -80d 34m 06.8s) |   C |    60 | 19.4 |        
    6847 | 2023-04-26 22:22:37 |         MASTER-SAAO | (02h 30m 18.93s , -80d 33m 02.0s) |   C |    60 | 19.2 |        
    6938 | 2023-04-26 22:24:08 |         MASTER-SAAO | (03h 24m 09.02s , -80d 32m 04.8s) |   C |    60 | 18.9 |        
    6938 | 2023-04-26 22:24:08 |         MASTER-SAAO | (03h 18m 55.56s , -80d 31m 02.8s) |   C |    60 | 18.8 |        
    7018 | 2023-04-26 22:25:27 |         MASTER-SAAO | (03h 14m 36.57s , -82d 24m 50.6s) |   C |    60 | 19.1 |        
    7018 | 2023-04-26 22:25:27 |         MASTER-SAAO | (03h 08m 05.05s , -82d 23m 46.8s) |   C |    60 | 19.0 |        
    7280 | 2023-04-26 22:29:49 |         MASTER-SAAO | (01h 58m 17.06s , -80d 34m 47.0s) |   C |    60 | 18.6 |        
    7280 | 2023-04-26 22:29:49 |         MASTER-SAAO | (01h 53m 06.21s , -80d 34m 07.7s) |   C |    60 | 18.4 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.


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